This is old - but may help someone. The display chunk that @lettis wants to alter is here:
/core/components/quip/elements/chunks/quipauthortpl.chunk.tpl
It is called from a property set attached to the Quip snippet.
Copy that chunk template, and create a new chunk in MODX Elements called myAuthorTpl. Paste the code from the original template:
[[+url:is=``:then=`[[+name]]`:else=`<a href="[[+url]]" rel="nofollow">[[+name]]</a>`]]
Edit as you see fit. You could take out the +url: filter entirely or use it to put the city in instead
Now create a new property set for Quip.
1. Go to Snippets > Quip > Quip (edit snippet)
2. click on Properties tab
3. click 'Add Property Set'
4. create a new property set (use the checkbox) or add to any existing Property Set you have made for your site (I use one per site for all my customisations) - eg myPropertySet
5. Create a new setting 'authorTpl' and give it a textfield value of 'myAuthorTpl'
6. Save the property set.
Now replace any calls to Quip with Quip@myPropertySet and in the output of the comment template you should now see myAuthorTpl being output instead of the default.
The reason to use a Property Set is that you won't have to make the change every time you update Quip. (Otherwise you could simply change the value of the authorTpl in the default property set)
You could go as far as updating the lexicon entry for website: quip.Website and set it to 'City', but my memory is that lexicon updates get overwritten each time.
